[R] symbols in lattice

[Torsten Hothorn]

Dear plotting experts, 

I simply can't figure out how I can force bwplot to print mathematical
symbols in the strips.

Example: 

x <- rnorm(30)
lab <- factor(c(rep("one", 10), rep("two", 10), rep("three", 10)))
bwplot(~ x | lab)

gives labels "one", "two", "tree" but I would like to change this into
expression(lambda == 1), expression(lambda == 2) and expression(lambda ==
3). 

The only way to modify the labels is changing the levels of lab, right? Or
is there something else?

Torsten

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